EP0452343A1 - Pleuelstange. - Google Patents
Pleuelstange.Info
- Publication number
- EP0452343A1 EP0452343A1 EP90900158A EP90900158A EP0452343A1 EP 0452343 A1 EP0452343 A1 EP 0452343A1 EP 90900158 A EP90900158 A EP 90900158A EP 90900158 A EP90900158 A EP 90900158A EP 0452343 A1 EP0452343 A1 EP 0452343A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- connecting rod
- component
- casting
- cast
- graphite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/02—Constructions of connecting-rods with constant length
- F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0085—Materials for constructing engines or their parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/16—Fibres
Definitions
- the invention relates to a connecting rod according to the preamble of claim 1.
- a connecting rod is known for example from DE-AS 1287868.
- the connecting rod of an internal combustion engine is exposed to a high pressure load generated by the ignition pressure during operation.
- the connecting rod shaft is usually fitted with a
- Such a connecting rod can be produced by forging or casting with relatively little effort. For higher pressure loads,
- connecting rods with a connecting rod shaft with an H-shaped cross section are used, which have a much greater resistance to buckling, but are very expensive to manufacture.
- increased strength is generally achieved, but also with considerably higher manufacturing costs.
- Increasing the kink resistance by increasing the wall thickness of the connecting rod shaft is a limit for reasons of weight alone
- the invention has for its object to provide a connecting rod of the generic type, which is characterized by a low weight and high resistance to buckling and can be manufactured inexpensively compared to fiber-reinforced connecting rods.
- a tensile stress is generated in the cast material during the manufacture of the connecting rod by the cast-in component, by which the compressive stress occurring during operation is reduced.
- the connecting rod can thus be designed for a lower maximum compressive stress and can therefore be made lighter.
- the connecting rod according to the invention is produced in a conventional manner by inserting the elongate component into the mold and then casting the casting material around it.
- the component When steel is used as the casting material, the component is heated to about 500 - 700 ° and expands accordingly.
- the liquid casting material cools down and, after reaching the solidification temperature, the cast-in casting material begins to pressurize the cast-in component. Since the coefficient of expansion of the component is smaller than that of the casting material, the casting material cannot contract freely and tensile stresses build up in it. When the ignition forces are subjected to pressure during operation, these tensile stresses are reduced before the connecting rod is subjected to pressure. This allows the connecting rod to be designed according to the resulting compressive forces, which are smaller than with the usual design.
- tensile stresses can be generated in the casting material in the production of the connecting rod according to the invention, which can amount to up to 60% of the maximum compressive stresses occurring during operation.
- the connecting rod shaft then only needs to be designed for around 40% of the maximum compressive stress occurring during operation, which can lead to a weight saving of up to 60% for the connecting rod shaft with a connecting rod with the same kink resistance.
- steel as the casting material and graphite for the cast component, a weight reduction of at least can be achieved
- the maximum pressure load on the connecting rod due to the ignition pressure is assumed to be 5 t
- the tensile load due to the mass acceleration forces in TDC is 1 t and the component in the cast material results in a tensile stress of
- the tensile load also increases to 3 t.
- the weight of the connecting rod is increased by the weight of the cast component.
- steel, titanium or a light metal alloy are the most suitable casting materials.
- Preferred materials for the elongated component are graphite and ceramic materials, in particular sintered bodies made of boron nitride, silicon nitride,
- Al 2 TiO 5 aluminum titanate
- the table below shows the characteristic values of these materials that are relevant to the invention.
- T s melting temperature
- the component preferably extends essentially over the entire length of the connecting rod shaft.
- FIG. 1 shows a longitudinal section of a connecting rod according to the invention
- Figure 2 shows a section along line 2-2 in Figure 1 and
- FIG. 3 is a diagram showing the thermal expansion of the above
- the connecting rod for an internal combustion engine shown in FIG. 1 consists of a cast part which has a piston pin eye 1, a half crankshaft bearing eye 2 and a connecting rod shaft 3 which connects parts 1 and 2.
- an elongated component 4 is cast, which consists of a
- the diagram of FIG. 3 shows the change in the linear coefficient of thermal expansion of graphite (C), titanium (Ti), steel (Fe) and a light metal alloy (A1) as a function of the temperature (T). While the thermal expansion of graphite remains essentially the same in the area of interest up to the solidification temperature of the casting material, which also applies to the ceramic materials specified for component 4, the coefficient of thermal expansion for the casting material increases more or less. When the casting material cools below the solidification temperature, which is about 800 ° - 1000 ° C for steel and titanium and about 500 ° C for the light alloy, there is a strong contraction of the casting material, while the expansion coefficient of the material of component 4 im remains essentially constant.
- the casting material Since the casting material is prevented by the component 4 from contracting freely, a high tensile stress is built up in the casting material, which, as described above, considerably reduces the maximum pressure load on the connecting rod during operation.
- Which material pairing is selected depends on the type of internal combustion engine for which the connecting rod is intended. In racing engines, which normally run at a very high speed, the tensile stress that occurs during operation is relatively high, so that one will choose a pair of materials with which a lower tensile stress is induced in the cast material during the production of the connecting rod than in the case of a connecting rod for a series engine , in which the difference between tensile and compressive loads occurring during operation is greater due to the lower speeds.
- the casting process should be carried out under at least partial vacuum in order to avoid decomposition of the graphite and carburization of the same when using steel as the casting material.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3843954A DE3843954A1 (de) | 1988-12-24 | 1988-12-24 | Pleuelstange |
DE3843954 | 1988-12-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0452343A1 true EP0452343A1 (de) | 1991-10-23 |
EP0452343B1 EP0452343B1 (de) | 1993-09-15 |
Family
ID=6370306
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90900158A Expired - Lifetime EP0452343B1 (de) | 1988-12-24 | 1989-12-12 | Pleuelstange |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0452343B1 (de) |
DE (2) | DE3843954A1 (de) |
WO (1) | WO1990007654A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4332444B4 (de) * | 1993-09-23 | 2006-06-01 | Bayerische Motoren Werke Ag | Maschinenteil aus einer Leichtmetall-Gußlegierung, insbesondere Pleuel für Hubkolbenmaschinen |
IT1284366B1 (it) * | 1996-02-02 | 1998-05-18 | Embraco Europ Srl | Biella per piccole macchine alternative, quali compressori per frigoriferi, e macchina alternativa incorporante tale biella. |
DE19752753A1 (de) * | 1997-11-28 | 1999-06-02 | Bayerische Motoren Werke Ag | Verfahren zum Bruchtrennen eines Lagerdeckels bei einem Pleuel für Hubkolbenmaschinen |
DE19753358C2 (de) * | 1997-12-02 | 2000-05-11 | Daimler Chrysler Ag | Pleuelstange für eine Hubkolbenmaschine sowie Verfahren zu ihrer Herstellung |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1287868B (de) * | ||||
US3698264A (en) * | 1970-12-28 | 1972-10-17 | Bertea Corp | Composite rod |
GB1460528A (en) * | 1974-05-15 | 1977-01-06 | Toyota Motor Co Ltd | Method for producing a metal and ceramic composite |
JPS5631537A (en) * | 1979-08-17 | 1981-03-30 | Honda Motor Co Ltd | Connecting rod for internal combustion engine |
JPS57155336A (en) * | 1981-03-20 | 1982-09-25 | Honda Motor Co Ltd | Production of fiber-reinforced composite body |
DE3248373C2 (de) * | 1982-12-28 | 1985-03-21 | Honda Giken Kogyo K.K., Tokio/Tokyo | Pleuelstange |
-
1988
- 1988-12-24 DE DE3843954A patent/DE3843954A1/de not_active Withdrawn
-
1989
- 1989-12-12 DE DE90900158T patent/DE58905648D1/de not_active Expired - Fee Related
- 1989-12-12 EP EP90900158A patent/EP0452343B1/de not_active Expired - Lifetime
- 1989-12-12 WO PCT/EP1989/001521 patent/WO1990007654A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9007654A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1990007654A1 (de) | 1990-07-12 |
DE3843954A1 (de) | 1990-06-28 |
EP0452343B1 (de) | 1993-09-15 |
DE58905648D1 (de) | 1993-10-21 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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